Saturday, September26, 2020
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Marine Weather and Tides
Felida, WA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:02AMSunset 7:01PM Saturday September 26, 2020 4:38 PM PDT (23:38 UTC) Moonrise 4:13PMMoonset 12:21AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ210 Columbia River Bar- 259 Pm Pdt Sat Sep 26 2020
In the main channel.. - general seas...4 to 6 ft through Saturday night, subsiding to 2 to 4 ft Sunday. - first ebb...around 2 am Sunday. Seas to 7 ft. - second ebb...around 245 pm Sunday. Seas to 6 ft. - third ebb...around 245 pm Sunday. Seas to 6 ft.
PZZ200 259 Pm Pdt Sat Sep 26 2020
Synopsis for the southern washington and northern oregon coast.. High pressure aloft builds Saturday night and strengthens through early next week. Surface thermal low pressure pushes north from california Sunday for northerly winds then northeasterly winds across the waters Monday and Tuesday.


7 Day Forecast for Marine Location Near Felida, WA
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location: 45.73, -122.75     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 262135 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 235 PM PDT Sat Sep 26 2020

SYNOPSIS. Decreasing showers tonight as high pressure builds over the region. Clearing skies and calming winds may result in shallow valley fog early Sunday morning, but should clear quickly as drier north to northeast winds develop. Offshore flow will increase Monday next week for drier and warmer conditions. Dry weather with above normal temperatures is expected through the end of the week.

SHORT TERM. Tonight through Tuesday . Showers will decrease later this evening as an upper ridge begins to build over the Pacific Northwest. Onshore flow weakens tonight as low level flow shifts northerly overnight becoming offshore Sunday. As high pressure builds clearing skies combined with lingering low-level moisture will likely lead to fog or low stratus forming in the interior valleys overnight. Expect skies to clear by late Monday morning as the offshore flow brings in drier air to the region.

Thermally induced low pressure develops over northern California Sunday as surface high pressure builds over Vancouver Island. The resultant pressure gradient will lead to breezy northerly winds through the valley and along the central Oregon coast. Temperatures will return to seasonable normals. Late Sunday into Monday the thermally induced surface trough will shift along the Oregon coast and deepen into southwest Washington. This will allow for more widespread and stronger offshore easterly flow Monday as the surface pressure gradient across the Cascades strengthens to around 5-8 mb. The offshore winds will be more gap driven with the strongest winds in the western Columbia River Gorge, and across the higher terrain elevations of the Cascades and coastal mountains where east gusts of 30 to 35 mph are possible. Similar conditions continue Tuesday as surface pressure pattern changes very little Monday night into Tuesday. Subsidence warming with the sinking air and sunny skies will lead to above average temperatures early next week with temperatures reaching the upper 70s to low 80s along the coast, and low to mid-80s inland.

A potential challenge to this forecast is smoke. It is difficult to forecast how much smoke the local wildfires will be producing after the recent rains, but any smoke remaining will be carried westward with the offshore winds. Since thermally induced troughs result in atmospheric instability, wildfires tend to become more plume dominated, and it is possible that the local wildfires will produce more smoke Monday and Tuesday. Have made a best guess of which areas will be impacted by smoke in the forecast, but the forecast confidence of the area extent or thickness of the smoke is low. The thickness of the smoke layer will determine any impacts on the temperature forecast. With the recent rain, the increased mixing from the trough, and the more gap flow nature of the east winds, do not anticipate that the smoke will be as thick or expansive as what was experienced following the development of the wildfire growth. DDH/TJ

LONG TERM. Tuesday night through Friday . There is general agreement among the models that the upper ridge axis will begin to shift inland Tuesday night and gradually progress eastward through the week. The thermally induced surface trough will likely shift inland over the Cascades Wednesday afternoon and evening. This will allow for light onshore flow and some marine influence to return to the coastal areas. Elsewhere a generally light continuation of offshore flow will continue drying and above normal daytime temperatures with nighttime lows near normal.

AVIATION. 00Z TAFs: Expect VFR conds to continue across the area for the evening as showers wind down. However, there may be brief periods where an aggressive shower may bring MVFR cigs/vsbys. Showers will dissipate in the early evening as the sun sets. Clearing skies will lead to fog/low stratus development along the central coast later this evening and eventually for the north coast and typical favored inland areas overnight. Fog/low stratus will largely dissipate near 27/18Z as flow becomes increasingly northerly then offshore late Sunday afternoon.

Refer to http://weather.gov/zse for detailed regional aviation weather and hazard information.

KPDX AND APPROACHES . VFR with showers dissipating nearer 02Z and closer to sunset. Expect residual moisture will form into an MVFR stratus cig at 020-025 for the morning arrivals. VFR returns by 27/18Z. /JBonk

MARINE. Winds will continue to weaken and become northwesterly Saturday afternoon and evening as high pressure builds over the northeast Pacific. Winds will become more northeasterly by late tonight/early Sunday and persist into early next week as thermally induced low builds up the northern CA and OR coastline. This will bring SCA level winds to the waters starting Sunday evening and last though Monday evening, possibly Tuesday morning. Will issue a SCA to cover the winds for all the waters, however the inner water wind threat will eventually be confined to downwind of the river mouths/coast range gaps.

As winds ease, distant swell from low pressure in the far northern Gulf of Alaska will send a building westerly swell across the waters. Combined seas likely reach 10-12 feet late Monday afternoon. If so, this would be a fairly quick hit as seas would then ease below 8 feet by late Tuesday morning. Have included this period at the end of the wind threat portion of the SCA. Seas then subside to near 5 feet before building toward 8 feet again later in the week. /JBonk

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory from 4 PM Sunday to 10 AM PDT Tuesday for coastal waters from Cape Shoalwater WA to Florence OR out 60 NM.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi51 min 66°F1021.6 hPa
ASTO3 - 9439040 - Astoria, OR 63 mi51 min SW 12 G 19 64°F 64°F1021.8 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi51 min 57°F1023.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR7 mi46 minWSW 710.00 miOvercast68°F53°F59%1021.6 hPa
Pearson Airfield, WA9 mi46 minVar 410.00 miOvercast68°F53°F59%1021.8 hPa
Portland, Portland International Airport, OR11 mi46 minNNW 510.00 miMostly Cloudy67°F54°F63%1022.1 hPa
Portland-Hillsboro Airport, OR17 mi46 minW 810.00 miMostly Cloudy69°F52°F55%1022 hPa
Portland, Portland-Troutdale Airport, OR22 mi46 minN 010.00 miOvercast68°F54°F61%1021.9 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
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Last 24hrNE5CalmW3CalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmW3CalmCalmCalmE3SE7SW43W8SW7
1 day agoW5W6CalmW4SE3S4S43S4CalmCalm3SE5SE8S6S6S6
G16
S6SE1055S9SW7W9
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2 days agoCalmS4SE4SE4SE4SE6S4W5SW3SW3SW4SW3S5SW4S5S4S6S76S4SW444W9

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Sat -- 01:22 AM PDT     Moonset
Sat -- 02:35 AM PDT     1.52 feet High Tide
Sat -- 07:03 AM PDT     Sunrise
Sat -- 11:23 AM PDT     -0.19 feet Low Tide
Sat -- 04:22 PM PDT     1.06 feet High Tide
Sat -- 05:12 PM PDT     Moonrise
Sat -- 05:13 PM PDT     1.05 feet Low Tide
Sat -- 06:59 PM PDT     Sunset
Sat -- 07:56 PM PDT     1.23 feet High Tide
Sat -- 11:38 PM PDT     0.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.21.51.51.31.10.90.90.80.50.1-0.2-0.10.20.60.9111.11.21.21.10.80.5

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Sat -- 01:23 AM PDT     Moonset
Sat -- 05:21 AM PDT     -0.09 feet Low Tide
Sat -- 07:07 AM PDT     Sunrise
Sat -- 11:22 AM PDT     6.32 feet High Tide
Sat -- 05:18 PM PDT     Moonrise
Sat -- 05:19 PM PDT     2.34 feet Low Tide
Sat -- 07:02 PM PDT     Sunset
Sat -- 10:43 PM PDT     6.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.34.12.81.50.5-0.10.112.445.56.36.25.64.73.72.82.42.53.44.65.96.76.9

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Portland, OR
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.